Recent content by SEG9585

  1. S

    What are the best wing designs for maximum efficiency in RC planes?

    I disagree a bit with the low-wing, dihedral suggestion -- using a high wing instead will give you that added stability without the expense of loss of lift. A high wing would be less maneuverable, but may better serve your purpose based on the nature of your competition or goals. A few...
  2. S

    How to Solve a Tough Concept Question: Rifle Aiming Experiment

    mal4mac is demonstrating that the time the bullet from rifle 2 is traveling through the air is 3.13 times the amount of time the bullet from rifle 1 traveled through the air. Now all you need to do is apply x = .5*g*t^2 to find the distance the bullet dropped iduring its flight. All you need...
  3. S

    Why Is This Dynamics Problem So Challenging?

    Small error here -- you have the wrong distance to the end of the link. It should be 50 + 80 + 30 = 160 mm. So: 160mm * 2*pi = 320*pi (5 rad/sec) / 2*pi = 800 mm 800 mm / (60mm radius)/pi * (2*pi radians/turn) = 26.67 rad/sec Now that you have omegaC, use that rotation rate to find the...
  4. S

    Find Node Points on a Beam: Analytical Solution

    Anyone there?? One thought I had was to use Newton's method but I've tried this and the radius of convergence seems to be too small for many of my cases.
  5. S

    Construct a Wind Power Generator: Determine Rotor Size for 3V & .2W

    They way I would approach this is: First I would have to figure out what motor I should use -- if you are provided with one, what motor RPM corresponds to an output voltage of 3V with a given load that would consume .2W (this can probably be tested). Once I know the RPM, I need to know what...
  6. S

    Find Node Points on a Beam: Analytical Solution

    Homework Statement Find the node points (zero displacement) for a clamped-pinned and clamped-spring beam. I am trying to figure out how to find these points on a beam of length L (constant E*I,m) for the first 3 natural frequencies. Homework Equations The Attempt at a Solution \upsilon(x,t)...
  7. S

    Physics of Computers ( for topics)

    Computers aren't just home PC's. You can talk about robotic controllers -- concepts of pulse width modulation, analog to digital converters, sensors, power distribution, input and output, RF, interrupts and timers, etc
  8. S

    Seemingly Simple Statics Problem

    you have 1 equation relating T1 T2 AND T3 you have a second equation relating T2 to T3, so you can substitute into the first for only 2 unknowns. Now you can get torque around another point to relate T1 to T3, or T1 to T2, and you should be all set. I recommend getting the torque around the...
  9. S

    Domino Experiment: Time Dependence on Number of Dominoes

    I would think it's a little predictable to some extent, since the only forces on a domino are its inital impulse plus gravity. When dominos are spaced farther apart, they hit the next domino with a greater linear impulse but transmit a smaller angular momentum (because it hits the domino at a...
  10. S

    What Does a 9V Battery Indicate in Electrical Terms?

    Sure -- one thing you need to remember is that the voltage in an object can only be measured relative to the voltage of another object. This is comparable to velocity in kinematics -- say you were walking at 3mph on a train moving 50mph. You are only moving 3 mph relative to the train, but you...
  11. S

    Calculate Rotational Body Rate for Vector Motion | Vector A & B

    Sorry if I am slow but I'm still not getting the results I need. Here's a specific example: A = [.4756 .8668 -.15] B = [.9361 .53 -.2248] I want to move from A to B at a rate of 5 degrees per second (magnitude), and record each new position of A every second (record A every time it...
  12. S

    Calculate Rotational Body Rate for Vector Motion | Vector A & B

    Imagine a 3-d plane, you are on the origin looking in a direction as defined by a unit vector. You want to move such that you will end up at another defined unit vector. Say you were looking at [1 1 1] and want to move to [0 0 1], to get there you would need a horizontal angular rate and a...
  13. S

    What Does a 9V Battery Indicate in Electrical Terms?

    Voltage is defined as the difference in charge between two points, regardless of the amount of energy each point has. So the answer would not be electric potential energy. The answer would be the electric potential, since the change in electric potential is known as Work.
  14. S

    Calculate Rotational Body Rate for Vector Motion | Vector A & B

    I've been stuck on this problem for a little while and was wondering if anyone could help me out: I have 2 unit vectors, say vector A and vector B. Vector B is stationary (never changes), while Vector A is arbitrary 3-d unit vector which may move with a 3-dimensional rotational body rate...
  15. S

    Adaptation to Seasons: The Evolutionary Explanation

    Sanaro-- He was asking whether or not seasons are necessary for life, not why seasons occur..
Back
Top